Electric power has been restored to nearly all affected customers across Puerto Rico after a sweeping blackout plunged the U.S. territory into darkness on New Year’s Eve.

Tens of thousands of customers are still without power across Puerto Rico, a week after Ernesto swiped the U.S. territory as a tropical storm.

Hurricane Ernesto has strengthened into a Category 2 storm as it barrels toward Bermuda after leaving hundreds of thousands of people in Puerto Rico without power or water.